package base;

import java.io.*;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

public class HttpServer {
        /** WEB_ROOT is the directory where our HTML and other files reside. * For this package, WEB_ROOT is the "webroot" directory under the
         * working directory.
         * The working directory is the location in the file system
         * from where the java command was invoked.
         */
        public static final String WEB_ROOT = System.getProperty("user.dir") + File.separator + "webroot"; // shutdown command
        private static final String SHUTDOWN_COMMAND = "/SHUTDOWN"; // the shutdown command received
        private boolean shutdown = false;

        public static void main(String[] args) {
            HttpServer server = new HttpServer();
            server.await();
        }

        //Listing 1.2: HttpServer 类的 await 方法
        public void await() {
        ServerSocket serverSocket = null;
        int port = 8080;
        try {
            serverSocket = new ServerSocket(port, 1, InetAddress.getByName("127.0.0.1"));
        } catch (IOException e) {
            e.printStackTrace();
            System.exit(1);
        }
        // Loop waiting for a request
        while (!shutdown) {
            Socket socket = null;
            InputStream input = null;
            OutputStream output = null;
            try {
                socket = serverSocket.accept();
                input = socket.getInputStream();
                output = socket.getOutputStream();

                // create Request object and parse
                Request request = new Request(input);
                request.parse();

                // create Response object
                Response response = new Response(output);
                response.setRequest(request);
                response.sendStaticResource();

                // Close the socket
                socket.close();

                //check if the previous URI is a shutdown command
                shutdown = request.getUri().equals(SHUTDOWN_COMMAND);
            } catch (Exception e) {
                e.printStackTrace();
                continue;
            }
        }
}

}
